Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk Management Financial Instruments and Risk Management (Narrative) (Details)

v2.4.0.8
Financial Instruments and Risk Management Financial Instruments and Risk Management (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Derivatives [Line Items]  
Deferred net gains on derivatives accumulated in other comprehensive income expected to be reclassified to net income in next twelve months $ 2,032,000
Maximum [Member]
 
Derivatives [Line Items]  
Remaining maturity of derivative contracts 2 years
Aggregate unrealized gain of derivative contracts with single counterparty $ 2,000,000